If there was any doubt Jimmy Carter is a really good ex-President, he provided another great argument while appearing on Tuesday's Daily Show — regaling host Jon Stewart with tales of building over 2 million latrines in Africa to help with sanitation and local taboos against women using the bathroom in daylight.

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But the most powerful part of his interview came when Stewart asked about Carter's negotiations with the grandfather of North Korea's current leader, Kim Jong Un.

Carter basically blamed successor George W. Bush for discarding a treaty he had negotiated and Bill Clinton shepherded through Congress. In the process, he said, Bush fed North Korea's significant paranoia, leaving the U.S. without a peace treaty when power transitioned to a young leader who may feel the need to prove his strength.

The former president also acknowledged regularly serving as a negotiator with China, talking over issues with the leaders there annually.

Which made me wonder: What exactly is Bush the younger doing with his time as an ex-President?